ALMA probes the Hubble Ultra Deep Field

These cutout images are from a combination of a background picture taken by the NASA/ESA Hubble Space Telescope (blue/green) with a new very deep view of the field (orange, marked with circles) by the Atacama Large Millimeter/submillimeter Array (ALMA). All the objects that ALMA sees appear to be massive star-forming galaxies.

This image is based on the ALMA survey by J. Dunlop and colleagues, covering the full Hubble Ultra Deep Field area.